<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
/*
    function foo ( a, b ) {

    }
    foo( 123, 456 );
*/


    // 在 js 中 函数的参数也是动态
    function foo () {

    }

    foo( 1,2,3,4,5,65,7,8,9 )
</script>
</html>